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  On the Tunnelling in Slate Formation in Taiwan

  In the Wanta-Sunglin hydropower project of Taiwan Power Company, a 5,947m-long tunnel passing through metamorphic slate formations was constructed by NATM method. Before the breakthrough of this tunnel in 2011, due to the variation of geological conditions, the excavation was blocked by shear zones with squeezing and creeping effects, until remedial measures and supporting adjustment were applied. Beside the difficult geological conditions, part of the alignment of this tunnel underpasses the Chuoshui River, which makes the support design even more challenging. This paper summaries the support designs, the tunnel deformation instrumentation, and the feedback analysis. In addition, the treatment and reinforced adjustment for the sections of river underpassing and shear zones were also illustrated and discussed. The experiences learned from this project can contribute to the other newly-built or rehabilitation hydropower projects in a similar situation.

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